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The Degree of Rotation Independence of Conjugation of S-N Bonds

机译:S-N键共轭的旋转度独立性

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摘要

The electron delocalization in pi-electron systems is frequently described qualitatively by the concept of conjugation between formal double bonds separated by a formal single bond.In carbon compounds the optimum conjugation usually requires a rather strict,geometrical condition:the exact or near coplanarity of the participating carbon atoms.However,the geometrical conditions are much less strict for third-row atoms if the bonding involves valence-shell d orbitals.In some sulfur compounds,such as N-sulfonylsulfilimines,the conjugation is almost unaffected within large ranges of bond-rotation angles,which amounts to rotation-independent conjugation.On the basis of the indications of earlier,limited studies using only minimal basis set and no geometry optimization,in the more extensive present study Density Functional Theory B3LYP calculations using 6-31G* basis set provide more reliable evidence for such flexible conjugation in some sulfur compounds and give an explanation for the experimentally observed interconversion of chiral conformers of N-sulfonylsulfilimines.
机译:π电子系统中的电子离域现象通常是用形式单键分开的形式双键之间的共轭概念来定性描述的。在碳化合物中,最佳的共轭通常需要相当严格的几何条件:分子的精确或接近共面性但是,如果键涉及价壳d轨道,则对第三行原子的几何条件的要求就不那么严格了。在某些硫化合物中,例如N-磺酰亚砜亚胺,在大范围的键范围内,共轭几乎不受影响。旋转角度等于旋转无关的共轭。基于较早的有限研究的指示,仅使用最小基集而不进行几何优化,而在更广泛的本研究中,使用6-31G *基集进行密度泛函理论B3LYP计算为某些硫化合物中的这种灵活的结合提供了更可靠的证据,并为专家提供了解释短暂地观察到了N-磺酰亚砜亚胺的手性构象体的相互转化。

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